Sewing machine



' Oct. 10, 1939.

cQw. MUELLER SEWING MACHINE Filed Feb. 26, 1937 15 Sheets-Sheet 1 62WNz/e ller Oct. 10, 1939. c. w. MUELLER SEWING MACHINE Filed 'Feb. 26,1957 15 Sheets-Shet 2 Oct. 10, 1939. c. w. MUELLER SEWING MACHINE FiledFeb. 26, 1937 15 Sheets-Sheet 5 Oct. 10, 1939.

C. W. MUELLER SEWING MACHINE Filed Feb. 26, 1937 15 Sheets-Sheet 4 Char/es W/Vue //er 72in Oct. 10, 1939.

C. W. MUELLER SEWING MACHINE Filed Feb. 26, 1937 15 Sheets-Sheet 5Char/e3 W Mueller Oct. 10, 1939. c. w. MUEALLER I SEWING MACHINE- FiledFeb. 26, 1937 15 Sheets-Sheet 6 Oct. 10; 1939. c. w. MUELLER SEWINGMACHINE Filed Feb. 26, 193'! v is Sheets-Sheet IIII Char/e3 WMue/AerOct. 10, 1939. c. w. MUELLER SEWING MACHINE 15 Sheets-Sheet 8 Filed Feb.26, 1937 Oct. 10, 1939.

Filed Feb. 26, 1937 vc. w. MUELLER SEWING MACHINE 15 Sheets-Sheet 9 n llCha r/es W Mae/Aer Oct. 10, 1939. I

C. W. MUELLER SEWING MACHINE Filed Feb. 26', 19:57- 15 sheets-sheet 1oElma/Wm Char/es 14 Mue//er Oct. 10, 1939. c. w. MUELLER 2,175,967

SEWING MACHINE Filed Feb. 26, 1937 15 Sheets-Sheet '11 1 i C/Z af/es Il/ MueM/er Oct. 10, 1939. c, w, MUELLER 4 2,175,967

' SEWING MACHINE Filed Feb. 26. 195'! 15 Sheets-Sheet 12 Ill/IA W/ RChar/es m/wefier Gama;

Oct. 10, 1939. c. w. MUELLER 2 7 7 I SEWING MACHINE Filed Feb. 26, 193715 Sheets-Sheet 1S Q2 g i JnvenZor Char/es 14 Mueller dizornqg I Oct.10, 1939.

c. w. MUELLER I 2,175,967

SEWING MACHINE Filed Feb. 2'6, 193'? 15 sneets sheet 14 C/z arr/e5WMOe//er Oct. 10, 1939. c. w. MIQJELLER 2,175,967

Filed Feb. 26, 1937 l5 Sheets-Sheet 15 I mmnnuu Char/es }V. MuellerPatented Oct. 10, 1939 UNITED STATES PATENT FF1E SEWING MACHINEApplication February 26, 1937, Serial No. 127,983

39 Claims.

This invention relates to new and useful improvements in sewing machinesgenerally, although more particularly to a blind stitch sewing machineof the post type such as is shown in my prior Patents 2,038,848 and2,038,849 issued Apr. 28, 1936.

In the sewing rooms of factories, the sewing machines are placed ontables which are of uniform height. It is of course desirable to locatethe stationary presser foot in a horizontal plane which is comfortablefor the operator when feeding work through the machine. In someoperations more room is required under the upper frame arm for the freepassage of the work than in others.

In some operations, the work overlies the post and therefore the manualmeans shown in my prior patents for adjusting the vertical position ofthe post to thereby vary the depth of needle penetration is under theseconditions not readily accessible to the operator.

The machine of my prior Patent 2,038,848 produces all deep or anchorstitches, whereas the machine of my prior Patent 2,038,849 producesalternate deep and shallow stitches, i. e., anchor and skip stitches,but is devoid of any means for changing to all deep or anchor stitches.

Among the several objects of the present invention are to provide amachine wherein the stationary presser foot will remain at the sameheight relative to the operator and yet afford increased room under theupper arm for the passage of work; to provide a remote control forvertically adjusting the position of the post with respect to the pathof the needle whereby the machine will be initially set for apredetermined depth of needle penetration in the material beingstitched, and to provide manually operable means for varying theeffective height of the ridge forming element which is mounted on thepost whereby either all shallow stitches, or alternate deep and shallowstitches may be produced.

With these and other objects in view which will more fully appear, thenature of the invention will be more clearly understood by following thedescription, the appended claims, and the several views illustrated inthe accompanying drawings.

In the drawings:

Figure 1 is a front elevation of a sewing machine constructed inaccordance with my invention,

Figure 2 is a left end elevation thereof, the work support being shownin section,

and the mechanism in section and showing the disc actuating lever in oneposition of adjustment,

Figure 8 is a similar View but showing the disc actuating lever in itsother position of adjustment,

Figure 9 is a vertical section taken on the line 9 -9 of Fig. '7,

Figure 10 is a vertical section taken on the line I0--|0 of Fig. 7,

Figure 11 is a vertical section taken on the line H. H of Fig.7,

Figure 12 is a horizontal section taken on the line l2l2 of Fig. 7,

Figure 13 is an enlarged vertical section taken through the standard andbase and showing the driving means for the disc,

Figure 14 is a vertical section taken on the line MM of Fig. 13,

Figure 15 is a detail section of the reduction gear coupling,

Figure 16 is a perspective view of the post housing, the post, and theremovable cover plate arranged in separated relation,

Figure 17 is a perspective View of the disc adjusting lever andeccentric mounting therefor,

Figure 18 is a vertical longitudinal section through the forwardlyextending arm, and showing the top feed mechanism and the needle drivingmechanism,

Figure 19 is a horizontal section thereof,

Figure 20 is a detail section taken on the line Ell-20 of Fig. 18,

Figure 21 is a detail section of the driving connections for the needleshaft, the looper bar and the top feed bar,

Figure 22 is an enlarged plan view of the presser foot,

Figure 23 is a detail view showing a modified form for verticallyadjusting the post,

Figure 24 is a sectional View thereof,

Figure 25 is a view similar to Fig. 23 but showing a retractile springinterposed between the toggle lever and the base arm,

Figure 26 is a horizontal section taken on the line 26-26 of Fig. 25,and

Figure 27 is a detail view of the link and lever connection shown inFigs. 25 and 26.

By reference to the accompanying drawings, it will be seen that myinvention includes a main frame A which comprises a standard 5 having ahorizontal upper arm 6 extending laterally from the upper end thereofand terminating in a forwardly extending upper arm 1 whose major axisinclines forwardly and downwardly as indicated by the numerals aa inFigure 2, and a horizontal base arm 8 which extends laterally from andbelow the base of the standard and terminates in a forwardly extendinghorizontal base arm 9, the upper arms 6, 1 being spaced above anddisposed in substantial registration with the base arms 8, 9 and theupper arm 1 being downwardly inclined relative to the base arm 9.Preferably, the standard 5 and the upper arm 6 are cast as a singleunit, the base arms 8 and 9 as a single unit, and the forwardlyextending upper arm 1 as a single unit, the units being rigidly althoughremovably connected together by screws or other fastening means.

Rigidly fixed to the forward or free end of the upper arm I, is ahorizontal presser foot B having a centrally located longitudinalopening or slot l formed therein, the presser foot being forwardly anddownwardly inclined in a plane disposed in parallelism to the major axisof the upper arm I, the plane of the foot being indicated by thenumerals bb in Figure 2.

Journaled in the upper end of the standard and in the upper arm 6 is amain shaft I I. Journaled in the forwardly extending upper arm 1 andextending longitudinally thereof is an oscillatory needle shaft l2having a needle arm l3 fixed to its front end. This shaft [2 is locateddirectly above the opening of the presser foot B, and has itslongitudinal axis in the downwardly and forwardly inclined plane a-a.Attached to the needle arm I3 is a curved needle H! which reciprocatesacross said opening H) of the foot. The needle shaft I2 is oscillatedfrom the main shaft I l by connections which are indicated as a whole bythe reference letter X. A looper or spreader l5 cooperates with theneedle I 4 in the usual manner to form single thread chain stitches,although any other type of complemental stitch forming mechanism may beemployed if desired. The looper I5 is fixed to a looper rod l6 which isfulcrumed on a depending arm I! pivoted on a horizontal pin 18 mountedin the left hand wall 1* of the arm I. The looper rod I6 is driven fromthe main shaft I i by the usual connections which are indicated as awhole by the reference letter Y.

Located directly under the presser foot B and movable upwardly towardsthe foot and downwardly therefrom, is a worksupportingpostC consistingof a base l9 and a head 20, the post being movable in an upwardly andforwardly inclined plane c-c which is disposed at right angles to theplane bb of the presser foot. The post C is rectangular in horizontalcross section and is mounted in a Z-part well or housing D, the righthand part or wall 2| being rigid with and projecting upwardly from theforward end of the base arm 9, and the left hand part or wall 22constituting a removable cover for the post and certain movable partswhich are located therein, the cover 22 being attached to the stationarywall ll by a screw 23. The upper edge of the housing D is located belowand in spaced relation to the presser foot B, and the upper portion ofthe post C projects upwardly above said upper edge. The walls 2|, 22 ofthe housing are conjointly formed with an opening to freely receive thepost C. The post C is guided in its vertical movements by front and rearvertical grooves 23, 24 formed in the post and cooperating front andrear vertical guide bars 25, 26 which are detachably connected to theinner face of the stationary wall 2! by screws 21. The head 20 of thepost is U-shaped in vertical cross section to form a base 28 and sidewalls 29, 29.

Carried by the post C and bodily movable up and down therewith are awork clamp E and a ridge-forming element F.

The work clamp E includes two separate clamping plates 30, 30 which arerelatively long and narrow, and cooperate with the bottom of the presserfoot B to clamp the work therebetween during the penetrating strokes ofthe needle. Bell crank levers 3!, 3| are arranged side by side betweenthe walls 29, 29 of the post head 20 and are fulcrumed at their angleson a transverse pin 32 mounted in the forward portions of the walls 29,each lever including a rearwardly extending or horizontal arm 33 and adownwardly extending or vertical arm 34. The arms 34, 34 projectdownwardly in front of the base 28 of the post head 20. The clampingplates 30, 30 are centrally journaled on transverse pivot pins 35, 35mounted in the rearwardly extending arms 33, 33 for independent rockingmovements. Coil springs 36, 36 are disposed between the arms 33, 33 andthe base 28 and function to yieldably retain the clamping plates againstdepression. Adjustable stop screws 31, 31 are threaded into the lowerends of the vertical arms 34, 34 and cooperate with the front wall ofthe base 28 to variably limit the upward movements of the clampingplates.

The ridge-forming element F which projects nodes of material upwardlythrough the slot ID of the presser foot into needle penetratingposition, comprises a disc which is located between the clamping plates30, 30 and in front of the pivots 35, 35. The disc is fixed to atransverse rock shaft 38 which is journaled in bearings 39, 39 mountedin the walls 29, 29 of the post head 20 whereby the disc may beoscillated forwardly and rearwardly. The axis of the disc i. e., theshaft 38, is located below and in parallelism with the path of movementof the needle 14, or in other words, at right angles to the line offeed. It will be also observed that the disc is located directly belowthe needle shaft l2, and in register with the opening IU of the presserfoot B, and is adapted to project intermittently nodes of materialupwardly through said opening IE1 into needle penetrating position. Thedisc is sector shaped in side elevation and includes a rear radial wall40 which merges with the concentric periphery 4| of the disc. Theperiphery of the disc at the rear end thereof is cut away to provide alow peripheral portion or step 42 which merges with the rear radial wall40. Thus it will be seen that the disc is provided with high and lowperipheral portions, or portions which are of different radii, and thatthese portions are arranged in tandem.

The disc is reciprocated from the main shaft II by a train of mechanismincluding a manually controlled lever whereby either the high and lowportions 4|, 42 of the disc will be alternately presented to the needleto thereby form alternate anchor and skip stitches in the material orwhereby the high portion 4! of the disc will be successively presentedto the needle to thereby form successive anchor stitches in thematerial. 7

To this end, a driving eccentric 43- is fixed to the main shaft llwithin the standard 5, and surrounding this eccentric is an eccentricsleeve 44 which is positively rotated on the eccentric but at one-halfthe speed thereof. A disc 45 which is loosely mounted on the main shaftis provided with an inwardly extending radial slot 46 for receiving aslide block 41 carried by the eccentric sleeve 44. A relatively smalldriving gear 48 is fixed to the main shaft for rotating the eccentricsleeve once for every two revolutions of the main shaft through themedium of a reduction gear coupling. This coupling comprises astationary countershaft 49 which is mounted in the standard 5 below themain shaft, a. relatively large gear 58 which is journaled on thecountershaft and in constant mesh with the gear 49, a gear 5| fixed tothe gear 5i to rotate therewith, and a gear 52 fixed to the disc 45, thegears 48, 50 having a 1-to-2 ratio and the gears 5!, 52 having a 1-to-1ratio. A rock shaft 53 is journaled in the base arm 8 and extendslongitudinally thereof and into the standard 5 and base arm 9. A rockarm 54 is fixed to the shaft 53 below the driving eccentric 43 and theeccentric sleeve 44,

and a pitman 55 has it upper end fitted around the eccentric sleeve andits lower end pivotally connected to the rock arm 55. The head 29 of thepost C is provided with a rearwardly extending bearing lug 56 whichsupports a transverse pivot pin 51 on which is journaled an eccentricbushing 58 having an upwardly extending rock arm 60 rigidly connectedthereto. A vertically disposed lever BI is fulcrumed centrally on theeccentric bushing 58. It will be noted that the eccentric bushing 58constitutes a shiftable fulcrum for the lever 6i, and that upon movementof the rock arm Bil the fulcrum will be shifted either towards or fromthe disc shaft 38. A forwardly extending link 62 is pivotally connectedat its rear end as at 62 to the upper end of the lever 61 and at itsforward end as at 53 to the disc F at a point below the axis thereof. Arock arm 64 is fixed to the rock shaft 53 at a point in aline- 1 mentwithin the base arm 9, and a link 65 which reason of the eccentricsleeve #4 being rotated once for every two revolutions of the mainshaft, the disc F, through the driving connections just described, willpartake of a greater angular movement during alternate rearward strokesthereof and a lesser angular movement during intermediate rearwardstrokes.

It will also be understood that when the rock arm 60 is in its rearwardposition, the eccentric bushing 58 will be in a position to cause thelever 6| to oscillate the disc F and thereby alternately present thehigh and low peripheral portions M, 42 of the disc to the needle toeffect the formation of alternate anchor and skip stitches in thematerial, or in other words, to alternately vary the depth of the needlepenetrations in the material. When, however, the rock arm 6!? is movedforwardly, the eccentric bushing 58 will be correspondingly rotated tothereby shift the fulcrum of the lever 6i forwardly. This causes thelever 61 to swing forwardly about the pivot 61 and bodily move the link62 forwardly, thereby rocking the disc F rearwardly whereby the highperipheral portion 4! thereof will be presented -to the needleduring-everyoscillation of the disc. This results in the successiveformation of deep or anchor stitches in the material, or, in otherwords, a uniform depth of needle penetrations in the material during theformation of successive stitches. It will, therefore, be seen that themachine is capable of forming either alternate deep and shallowstitches, i. e., anchor and skip stitches, or successive deep or anchorstitches, and that the change may be effected while the machine isrunning.

In order to releasably retain the rock arm 60 in either of its extremepositions, a spring pressed plunger pin 68 is mounted in the base IQ ofthe post C for cooperation with either of two seats 69, 10 which areformed in a forwardly projecting offset portion H of said rock arm 6%,said portion H overlying the base it and the pin 68. Upper and lowerstop screws l2, "F2 are mounted on the offset portion H above and belowthe seats 69, 10 for cooperation with the pin 68.

A substantially horizontal work support G is located in front of thestandard 5 and is provided adjacent its left end with a forwardlyextending slot M for receiving the post C, the work clamp E and the discF. The work support G is disposed in a horizontal plane below the upperframe arm 6' but in front thereof, the support being transversely curvedto form a resultant downwardly extending rear edge portion '55. Thesupport is rigidly although removably secured to the main frame Athrough the medium of downwardly extending bracket arms '56, i? whichare respectively clamped to the front right hand edge of the base arm 8and to the edge of the forwardly extending base arm a by clamping screwsi8, 19.

It will be observed that the left hand end of the work support G isdisposed above the control rock arm 86, and in order to facilitate theoperation of said arm I have provided a remote control therefor. To thisend, a rock shaft 89 is journaled in bearings which depend from the worksupport. This shaft extends across the work support and in front of thepost C. The left hand end of the shaft is provided with a rock arm Mwhich is pivotally connected by a screw 82 with the forward end of alink 83, the rear end of which is pivotally connected by a screw 8&-with the rock arm 68. The right hand end of the shaft is disposed infront of the standard 5 and is provided with a manually operable rocklever 85 which projects upwardly through a slot 86 in the work support.Thus, by means of the lever 85, the shaft 8%, and the link 83, thecontrol lever iii may be readily actuated. It will be observed that byplacing the shaft 8215 under the work support and by placing the lever35 in front of the standard, the space on the work support directly infront of the space under the overhanging arm 6 of the main frame isunobstructed and consequently the work may be moved rearwardly withperfect freedom.

In some sewing operations, the work support will not be required andunder these circumstances the work support together with the remotecontrol for the disc may be readily removed as a unit by simply removingthe clamping screws 18, i9 and the pivot screw 8%, and the rock arm 6!]may then be manually and directly operated as a control lever for thedisc C.

The post C is capable normally of a small free vertical movement topermit not only a variation in the thickness of materials beingstitched, but also to permit seams being fed over the ment of the postrelative to the core. The upper ridge-forming disc F. To this end, thehead I9 and base 29 of the post C are conjointly formed with a centrallydisposed. bore 9! which extends into the post from the lower endthereof, and mounted in said bore is a core or support 88. A limitingscrew 89 passes downwardly through a non-threaded opening 99 in the head29 and has its lower end threaded into the core or support 88, the head9I of the screw cooperating with the head of the post to limit theupward movesurface of the core is normally spaced below the upper end ofthe bore 81 and the upper portion of the core is reduced to form aresultant peripheral recess 92 for receiving a coil spring 93 whichengages the bottom wall of the recess and the upper end of the bore 81and functions to yieldably retain the post C against downward movementrelative to the core 88.

The support or core 88 is normally locked against vertical movement, butwhen the core is moved vertically the post C, the work clamp E and thedisc F are moved with it. The lower end of the core 88 is provided witha depending lug A toggle is connected to the lug 94 and to the base arm9 of the main frame. The toggle includes a bell crank lever 95 whichincludes a substantially vertical arm 99 and a forwardly extending andsubstantially horizontal arm 97. The lower end of the arm 96 isfulcrumed on an eccentric 98 which is fixed to a horizontal shaft 99,the latter extending across the well D and below the core 88 and havingits ends journaled in the base arm 9 of the main frame. A normallyvertically disposed link I90 is pivotally connected at its upper end bya pin I9I to the lug 94 and. at its lower end by a pin 92 to the upperend of the toggle lever arm 96, the pin I92 being rigidly secured to thelink It!) by a set screw HIS. A coil spring :34 is disposed around theprojecting end of the pin I02, one end of the spring being anchored in atransverse slot I95 formed in the end of the pin and the other end ofthe spring engaging under a stop pin Hi9 fixed to the bell crank lever95. The spring I94 functions to yieldably retain the toggle elements 95,I90 in their vertical or locked positions, and a stop shoulder IiI'Ifixed to the vertical arm 99 cooperates with a stop shoulder I98 on thebottom of the link I99 to prevent the toggle elements passing beyondtheir locked positions. It Will be noted that the vertical arm 99 andthe link I09, when in normal or locked position are in verticalalinement i. e., the pivots 98, NH, 32 are in alinement in a plane whichis slightly inclined to the vertical, or in other words in a plane atright angles to the plane of the foot B. A chain I99 adapted to beconnected to a treadle or kneepress, has its upper end connected to theouter end of the horizontal arm 9'1 of said bell crank lever. Thus, uponoperation of the knee-press or treadle the toggle will be broken and thesupport or core 98 together with the post C and the parts mountedthereon, will be depressed to permit the ready insertion or withdrawalof the material, and upon release of said knee-press or treadle theparts will be returned to their normal position by the spring I04.

In order to positively adjust the normal vertical position of the post Cand thereby set the machine for materials of different thicknesses, Ihave provided a hand adjusting shaft I I I! which is journaled in abushing III mounted in a tubular bearing bracket H2 secured in anopening H3 formed in the front wall II4 of the standard 5. The bearingbracket H2 is located slightly above the rear edge of the work support Gand consequently the shaft III] is readily accessible to the operator. Afinger knob H5 is rigidly attached to the front end of the shaft I I9and is provided with a series of rearwardly projecting teeth II6arranged concentrically thereon for engagement with a spring pin I I!mounted in the bearing bracket IIZ. A pointer H9 is fixed to the bracketH2 and overhangs the knob II5 for cooperation with a series of numeralsI I9 arranged sequentially on the front face of the knob. The inner endof the bracket H2 is provided with a pair of arms I20, I29 in which isfixed a horizontal bearing pin I2I on which is journaled a worm wheelI22 which is in constant mesh with a worm I23 formed on the inner end ofthe shaft H9. Journaled in the base arm 8 and extending longitudinallythereof is a rock shaft I24 having a rock arm I25 fixed to its righthand end, said arm being pivotally connected as at I26 to the lower endof a link I2'I, the upper end of the link being pivotally connected asat I28 to the worm wheel I22. The other end of the rock shaft I24registers with the base arm 9 and fixed thereon is a rock arm I29 whichis pivotally connected as at I30 to the rear end of a rack bar I3I whichextends forwardly along the base arm 9 to a point below and in front ofthe horizontal shaft 99. The rack bar I3I is provided along its upperforward edge with rack teeth I32 which engage the teeth of a pinion I33fixed on said shaft 99. A disc I34 is journaled on the shaft 99 and isprovided with a pin I35 forming a support for the front end of said rackbar. A coil spring I36 has its rear end connected to a pin I37 supportedon the disc above the pinion I33 and its forward end anchored by a pinI33 fixed to the base arm 9. The disc I34 is in the nature of a leverand the spring I36 exerts a pull on the upper end of the lever tomaintain the rack bar in yieldable engagement with the pinion. Thus whenthe knob H5 is rotated the rack bar I3I will be moved endwise, the shaft99 together with the eccentric 98 will be rotated, and the post C willbe raised or lowered, depending on the direction of rotation of theknob.

A top feeding mechanism is employed for intermittently feeding thematerial rearwardly in timed relation to the needle reciprocations. A4-motion feed dog I39 cooperates with the clamping plates 30, 39 of thework clamp E and operates in the opening III of the presser foot B. Thefeed dog is fixedly secured to the front end of a feed lever I40 whichextends longitudinally of the forwardly extending upper frame arm I. Therear end of the feed lever is connected to an adjustable eccentric whichis indicated as a whole by the reference numeral I4! and which ismounted on the main shaft II. This adjustable eccentric is of usualconstruction and therefore a specific description thereof isunnecessary. It will be noted that the feed lever I40 is locatedadjacent the right hand wall I of the frame arm I.

Formed in the wall 1* of the frame arm I are spaced front and rearbearing openings I42, I43 respectively, and adapted to be positioned ineither opening is a bearing pin I44 on the inner end of which isfulcrumed the lower end of a vertical link I45. The upper end of thelink carries a pivot pin I46 which is adapted to engage in either one offront and rear threaded II openings I41, I48 respectively formedcentrally in the feed bar, the pivot pin being accessible in eitherposition through an opening I49 formed in the wall l of the frame arm Iand located above the bearing openings I42, I43. Thus, the fulcrum linkfor the feed bar may be shifted forwardly or rearwardly relative .to theadjustable eccentric and thereby vary the height of the up and downmovement of the feed dog. When forming short stitches, say six or morestitches to the inch, the bearing pin I44 is positioned in the frontbearing opening I42 of the frame arm I, and the pivot pin I 46 ispositioned in the front opening I4! of the feed lever. In this positionof the link, the feed dog will clear the fabric and will not interferewith the looper I5.

Heretofore, in blind stitch machines of the forwardly extendingstitching arm type, as exemplified in the patent to Dearborn 814,025,Mar. 6, 1906, both the feed 'bar and the looper rod are supported on theright hand wall of the arm. This arrangement, in order for the looperrod to clear the feed bar, necessitates the relatively low positioningof the looper rod pivot, with the attendant disadvantage of having aportion of the arm or a portion of the looper rod located in ahorizontal plane below the foot. This downwardly projecting portion ofthe arm or rod, or both, causes the stitched work after leaving thepresser foot, to be directed downwardly.

In the present invention, the above objection is avoided by supportingthe feed bar and the looper rod on the right and left hand wallsrespectively of the stitching arm, whereby the looper rod Divot may belocated in a higher plane than heretofore, and whereby the work may bedirected freely under the arm. It will be also noted that in addition tothe above, the downward and forward inclination of the arm furtherassists in the freedom of travel of the work.

In Figures 23 and 24, I have illustrated a modified form of manuallyoperable means for vertically adjusting the post C which is adapted tobe employed when a work support is not used. In this construction thehorizontal shaft 99 is provided with a gear segment I50 which is locatedwithin the housing portion '2I and is in constant mesh with a pinion I5Ifixed on the inner end of a horizontal shaft I52 journaled in the wallof said housing portion 2|. A hand piece I 53 is fixed to the outer endof the shaft I52 and a spring detent I 54 cooperates with the hand pieceto retain the same in an adjusted position. Thus by turning the handpiece I53, the pinion I 5i will actuate the shaft 99, and the eccentric98 will raise or lower the post C.

A coil spring I3I has its rear end connected to the rack bar HI and itsrear end anchored to the base arm 9, and functions to take up any looseplay in the train of mechanism which actuates the disc.

Instead of employing the toggle lever 95, link i B!) and the torsionspring I54, I may employ the construction shown in Figures 25 and 26. Inthese figures, the vertical arm I55 of a Tlever IE5 is fulcrumed on theeccentric as, and the lever includes forwardly and rearwardly extendingarms I51, E58 respectively. A vertical link I59 is pivotally connectedat its upper end by the pin IGI to the lug 94 and at its lower end bythe pin I02 to the upper end of the vertical arm I55, the lower endbeing spaced from the hub of the lever. A link ISO is pivotallyconnected at its forward end as at ItI to the rearwardly extending armI58 of the lever. A coil tension spring I62 extends longitudinallywithin the base arm 9 and has its front end connected to the rear end ofthe link I69 and its rear end connected to a screw eye I63 which hasthreadable connection with a nut I64 mounted in said base arm. Byadjusting the nut I64 the tension of the spring may be varied. When thepost is in its normal or highest position, the toggle is in its lockedposition, and the toggle lever IE6 is retained against rearward swingingby means of the rear arm I58 of said lever contacting a horizontal stoppin I65 mounted in the base arm 9. The chain we is connected to theforwardly extending arm I51 of the toggle lever, and consequently whenthe chain is operated the toggle will be broken against the tension ofthe spring I62 and the post will be depressed.

Instead of employing the rack bar IS-I and pinion I33, I may substitutea link I65 having pivotal connection at its forward end as at Iii-I witha. rock arm I68 which as shown is in the form .of a disc fixed to theshaft I02. A spring 569 which has one end connected to said disc and theother end anchored to the base, functions to take up any slack betweenthe movable parts.

From the foregoing, it will be seen that I have provided a main frame ofthe post type wherein the work will have complete freedom in passingrearwardly from the foot and under the arm; that separate manuallyoperable are located at points remote from the post for operating thepost adjusting means and the adjusting means for the ridge-formingelement respectively, whereby access to the same may be had when work isin the machine, and that by operating the adjusting means for theridge-forming element either alternate deep and shallow needlepenetrations, or all deep needle penetrations, may be made.

It is of course to be understood that the details of structure andarrangement of parts may be variously changed and modified withoutdeparting from the spirit and scope of my invention.

I claim:

1. In a. sewing machine, a main frame com-prising a standard, upper andlower spaced arms extending laterally from the standard, the upper armbeing downwardly and forwardly inclined relative to the lower arm, andan upwardly and forwardly inclined post mounted on the free end of thelower arm and disposed below the free end of the forwardly anddownwardly inclined upper arm, the major axis of the forwardly anddownwardly inclined upper arm and the major axis of the post beingdisposed in planes at right angles to each other.

2. In a sewing machine, a main frame comprising a standard, an upper armextending laterally from the upper end thereof and terminating in aforwardly extending arm, a base arm extending laterally from the lowerend of the standard, said forwardly extending arm being downwardlyinclined relative to the base arm, and an upwardly and forwardlyinclined post mounted on the free end of the base arm and disposed belowthe free end of the forwardly and downwardly inclined upper arm,'themajor axis of the forwardly and downwardly inclined upper arm and themajor axis of the post being disposed in planes .at right angles to eachother.

3. In a sewing machine, a main frame comprising a standard, an upper armextending laterally from the upper end thereof and terminating in .aforwardly extending arm, a base arm extending laterally from the lowerend of the standard and

